I personly think it's hard to sell without an additional bathroom.

Students were practically knocking down the door to get in....AND they've already asked if they can extend their leases for an extra year.  

Plus, I've heard the rule of thumb that you should get $100 per door per month assuming 100% financing (in which case the cash flow is negative).

Finally go and knock on their door, but mention that you sent a letter and didnt hear back and...blah blah blah, but its important to say with a big smile, "i mailed you a letter (or postcard) and i was just following up and seeing what you think....." or whatever, because that establishes the rapport that your looking for. a warm greeting instead of a cold greeting (ie cold call)Then ask them about it and see what the heck is going on.

My husband and I started to work in the house to make it look great again and finally rent it, but now that it is almost finished and ready to be rented the 4 apartments, the city didn't give me the permission to have 4 electric meters because they say that the house and the land don't have the enough required size for the new codes to be divided in 4 apartments , so they only gave me the permission for 2 electric meters, and this is a problem because the house is completely divided in 4 units with kitchens and bathrooms etc..  

It seems like most investors around the sight like to see at least $150-$200 per door per month in cashflow.

For example, if I were to remove a window and put in a new patio door and it cost me $450 I could have it be a expense even though it would be clearly a capital expenditure.

I've recently gotten much bolder in my attempts, and I've actually started knocking on some doors.  

Rather than starting with direct mail, consider starting with door knocking.

Im in Delaware needing some help, to get my foot in the door with Investing.